Effects of toxin from a crude extract of Exserohilum turcicum on disease
symptom development in sweet corn
After treating the 2-wk-old susceptible sweet corn plants, ‘Hibrix3’,
with the toxin of E. turcicum isolate DI, the results showed that the leaves of
sweet corn revealed brownish black lesions with a yellow rim around the
lesions. The lesions have a long oval shape along the length of the leaf. The
lesion induced by the toxin was the same as the one caused by the E. turcicum
infection. Moreover, the expanded chlorotic area varied by the concentration of
the toxin used; a high dose of the toxin caused symptoms throughout the whole
leaf (Fig. 4).